<?php

declare(strict_types=1);

namespace Tests\Support;

use InvalidArgumentException;

final class TestLaneBudget
{
    public function __construct(
        public readonly int $thresholdSeconds,
        public readonly string $baselineSource,
        public readonly string $enforcement,
        public readonly string $lifecycleState,
        public readonly ?int $baselineDeltaTargetPercent = null,
        public readonly ?string $notes = null,
        public readonly ?string $reviewCadence = null,
    ) {
    }

    /**
     * @param  array<string, mixed>  $budget
     */
    public static function fromArray(array $budget): self
    {
        if (! isset($budget['thresholdSeconds'], $budget['baselineSource'], $budget['enforcement'], $budget['lifecycleState'])) {
            throw new InvalidArgumentException('Budget declarations must define thresholdSeconds, baselineSource, enforcement, and lifecycleState.');
        }

        return new self(
            thresholdSeconds: (int) $budget['thresholdSeconds'],
            baselineSource: (string) $budget['baselineSource'],
            enforcement: (string) $budget['enforcement'],
            lifecycleState: (string) $budget['lifecycleState'],
            baselineDeltaTargetPercent: isset($budget['baselineDeltaTargetPercent']) ? (int) $budget['baselineDeltaTargetPercent'] : null,
            notes: isset($budget['notes']) ? (string) $budget['notes'] : null,
            reviewCadence: isset($budget['reviewCadence']) ? (string) $budget['reviewCadence'] : null,
        );
    }

    /**
     * @return array<string, int|float|string>
     */
    public function evaluate(float $measuredSeconds): array
    {
        $budgetStatus = 'within-budget';

        if ($measuredSeconds > $this->thresholdSeconds) {
            $budgetStatus = in_array($this->enforcement, ['report-only', 'warn'], true)
                ? 'warning'
                : 'over-budget';
        }

        return array_filter([
            'thresholdSeconds' => $this->thresholdSeconds,
            'baselineSource' => $this->baselineSource,
            'enforcement' => $this->enforcement,
            'lifecycleState' => $this->lifecycleState,
            'baselineDeltaTargetPercent' => $this->baselineDeltaTargetPercent,
            'measuredSeconds' => round($measuredSeconds, 6),
            'budgetStatus' => $budgetStatus,
            'notes' => $this->notes,
            'reviewCadence' => $this->reviewCadence,
        ], static fn (mixed $value): bool => $value !== null);
    }

    /**
     * @param  array<string, mixed>  $budgetTarget
     * @return array<string, int|float|string>
     */
    public static function evaluateBudgetTarget(array $budgetTarget, float $measuredSeconds): array
    {
        if (! isset($budgetTarget['targetType'], $budgetTarget['targetId'])) {
            throw new InvalidArgumentException('Budget targets must define targetType and targetId.');
        }

        $evaluation = self::fromArray($budgetTarget)->evaluate($measuredSeconds);

        return array_merge([
            'budgetId' => (string) ($budgetTarget['budgetId'] ?? sprintf('%s-%s', $budgetTarget['targetType'], $budgetTarget['targetId'])),
            'targetType' => (string) $budgetTarget['targetType'],
            'targetId' => (string) $budgetTarget['targetId'],
        ], $evaluation);
    }

    /**
     * @param  list<array<string, mixed>>  $budgetTargets
     * @param  array<string, float>  $classificationTotals
     * @param  array<string, float>  $familyTotals
     * @return list<array<string, int|float|string>>
     */
    public static function evaluateBudgetTargets(
        array $budgetTargets,
        float $laneSeconds,
        array $classificationTotals,
        array $familyTotals,
    ): array {
        $evaluations = [];

        foreach ($budgetTargets as $budgetTarget) {
            $targetType = (string) ($budgetTarget['targetType'] ?? '');
            $targetId = (string) ($budgetTarget['targetId'] ?? '');

            if ($targetType === '' || $targetId === '') {
                continue;
            }

            $measuredSeconds = match ($targetType) {
                'lane' => $laneSeconds,
                'classification' => (float) ($classificationTotals[$targetId] ?? 0.0),
                'family' => (float) ($familyTotals[$targetId] ?? 0.0),
                default => 0.0,
            };

            $evaluations[] = self::evaluateBudgetTarget($budgetTarget, $measuredSeconds);
        }

        return $evaluations;
    }

    /**
     * @param  array<string, mixed>  $contract
     * @return array<string, int|float|string>
     */
    public static function evaluateGovernanceContract(array $contract, float $measuredSeconds): array
    {
        foreach (['laneId', 'summaryThresholdSeconds', 'evaluationThresholdSeconds', 'normalizedThresholdSeconds'] as $requiredKey) {
            if (! array_key_exists($requiredKey, $contract)) {
                throw new InvalidArgumentException(sprintf('Governance contracts must define [%s].', $requiredKey));
            }
        }

        $normalizedThresholdSeconds = (float) $contract['normalizedThresholdSeconds'];

        if ($normalizedThresholdSeconds <= 0) {
            throw new InvalidArgumentException('Governance contracts must define a positive normalizedThresholdSeconds value.');
        }

        $enforcementLevel = (string) ($contract['enforcementLevel'] ?? 'warn');
        $budgetStatus = 'within-budget';

        if ($measuredSeconds > $normalizedThresholdSeconds) {
            $budgetStatus = in_array($enforcementLevel, ['report-only', 'warn'], true)
                ? 'warning'
                : 'over-budget';
        }

        return array_filter([
            'laneId' => (string) $contract['laneId'],
            'summaryThresholdSeconds' => (float) $contract['summaryThresholdSeconds'],
            'evaluationThresholdSeconds' => (float) $contract['evaluationThresholdSeconds'],
            'normalizedThresholdSeconds' => $normalizedThresholdSeconds,
            'baselineSource' => (string) ($contract['baselineSource'] ?? 'measured-lane'),
            'enforcementLevel' => $enforcementLevel,
            'lifecycleState' => (string) ($contract['lifecycleState'] ?? 'draft'),
            'decisionStatus' => (string) ($contract['decisionStatus'] ?? 'pending'),
            'measuredSeconds' => round($measuredSeconds, 6),
            'budgetStatus' => $budgetStatus,
            'reconciliationRationale' => isset($contract['reconciliationRationale']) ? (string) $contract['reconciliationRationale'] : null,
        ], static fn (mixed $value): bool => $value !== null);
    }

    /**
     * @param  array<string, mixed>  $baselineSnapshot
     * @param  array<string, mixed>  $currentSnapshot
     * @return array<string, float>
     */
    public static function compareSnapshots(array $baselineSnapshot, array $currentSnapshot): array
    {
        $baselineSeconds = round((float) ($baselineSnapshot['wallClockSeconds'] ?? 0.0), 6);
        $currentSeconds = round((float) ($currentSnapshot['wallClockSeconds'] ?? 0.0), 6);
        $deltaSeconds = round($currentSeconds - $baselineSeconds, 6);
        $deltaPercent = $baselineSeconds > 0.0
            ? round(($deltaSeconds / $baselineSeconds) * 100, 6)
            : 0.0;

        return [
            'baselineSeconds' => $baselineSeconds,
            'currentSeconds' => $currentSeconds,
            'deltaSeconds' => $deltaSeconds,
            'deltaPercent' => $deltaPercent,
        ];
    }

    /**
     * @param  array<string, mixed>  $contract
     * @param  array<string, mixed>  $baselineSnapshot
     * @param  array<string, mixed>  $currentSnapshot
     * @param  list<string>  $remainingOpenFamilies
     * @param  list<string>  $followUpDebt
     * @return array<string, mixed>
     */
    public static function buildOutcomeRecord(
        array $contract,
        array $baselineSnapshot,
        array $currentSnapshot,
        array $remainingOpenFamilies,
        string $justification,
        array $followUpDebt = [],
    ): array {
        $comparison = self::compareSnapshots($baselineSnapshot, $currentSnapshot);

        return array_filter([
            'outcomeId' => sprintf('%s-final-outcome', (string) ($contract['laneId'] ?? 'heavy-governance')),
            'decisionStatus' => (string) ($contract['decisionStatus'] ?? 'pending'),
            'finalThresholdSeconds' => round((float) ($contract['normalizedThresholdSeconds'] ?? 0.0), 6),
            'finalMeasuredSeconds' => $comparison['currentSeconds'],
            'deltaSeconds' => $comparison['deltaSeconds'],
            'deltaPercent' => $comparison['deltaPercent'],
            'remainingOpenFamilies' => array_values($remainingOpenFamilies),
            'justification' => $justification,
            'followUpDebt' => $followUpDebt !== [] ? array_values($followUpDebt) : null,
        ], static fn (mixed $value): bool => $value !== null);
    }

}